This excerpt taken from the JAZZ 10-K filed Mar 31, 2008.
Attributes of JZP-4
We are developing JZP-4 to address the unmet needs of patients with epilepsy and bipolar disorder for a more effective product with fewer side effects. JZP-4 is being developed as a controlled release product that can be taken once a day, with a shorter titration schedule and fewer interactions with other drugs than current therapies. The active pharmaceutical ingredient in JZP-4 is an antiepileptic drug in the same class of drugs, and with a similar chemical structure, as Lamictal, an antiepileptic drug approved for the treatment of epilepsy and bipolar disorder. We believe that JZP-4 has the potential to provide the demonstrated efficacy of antiepileptic drugs in treating these conditions while addressing many of the adverse side effects of current therapies. In particular, our pharmacokinetic studies indicate that the active pharmaceutical ingredient in JZP-4 may result in a favorable titration schedule. Preclinical studies also indicate that the active pharmaceutical ingredient in JZP-4 may have fewer adverse drug interactions than current therapies. In addition, we believe that JZP-4 has the potential to be effective in treating bipolar depression with minimal sedation, low incidence of weight gain and limited risk of causing mood switches, thereby addressing a significant unmet need for this patient population.